Magnetic Proximity Effect in Perovskite Superconductor/Ferromagnet Multilayers

Details Magnetic Proximity Effect in Perovskite Superconductor/Ferromagnet Multilayers Magnetic Proximity Effect in Perovskite Superconductor/Ferromagnet Multilayers

2004-08-13

arxiv.org/abs/cond-mat/0408311v1

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures, submitted to PRL

Scientific paper

10.1103/PhysRevB.71.140509

$\mathrm{YBa_2Cu_3O_7/La_{2/3}Ca_{1/3}MnO_3}$ superconducting/ferromagnetic (SC/FM) multilayers have been studied by neutron reflectometry. Evidence for a characteristic difference between the structural and magnetic depth profiles is obtained from the occurrence of a structurally forbidden Bragg peak in the FM state. The comparison with simulated reflectivity curves allows us to identify two possible magnetization profiles: a sizable magnetic moment within the SC layer antiparallel to the one in the FM layer (inverse proximity effect), or a ``dead'' region in the FM layer with zero net magnetic moment. The former scenario is supported by an anomalous SC-induced enhancement of the off-specular reflection, which testifies to a strong mutual interaction of SC and FM order parameters.

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